{
    "type": "record",
    "name": "row",
    "fields": [
        {"name": "id", "type": "long"},
        {"name": "blockNo", "type": "int"},
        {"name": "val1", "type": "string"},
        {"name": "val2", "type": "float"},
        {"name": "val3", "type": "int"}
    ]
  }